Varnish for printing inks and its method of preparation

Abstract

A printing ink varnish which comprises a mineral oil and a product prepared by adding an anionic surfactant to an acid sludge followed by neutralization with an aqueous solution of an alkali metal salt and then adding an inorganic polyvalent metal salt to the mixture to form polyvalent metal salts of the anionic surfactant and acid components of said sludge. A process for preparing the varnish is also disclosed.

What is claimed as new and desired to be secured by Letters Patents of the United States is: 
     
       1. A varnish for a printing ink which comprises a mineral oil and a product prepared by adding an anionic surfactant to an acid sludge, neutralizing said acid sludge with an aqueous solution of an alkali metal salt and then, adding an inorganic polyvalent metal salt to the mixture to form polyvalent metal salts of said anionic surfactant and acid components of said acid sludge. 
     
     
       2. The varnish for a printing ink of claim 1, wherein said acid sludge is selected from transformer oil sludge, spindle oil sludge, machine oil sludge and motor oil sludge. 
     
     
       3. The varnish for a printing ink of claim 1, wherein said acid sludge is selected from machine oil sludge and motor oil sludge. 
     
     
       4. The varnish for a printing ink of claim 1, wherein said acid sludge is a polymerized sludge of a pitch prepared by heating a transformer oil sludge or a spindle oil sludge. 
     
     
       5. The varnish for a printing ink of claim 1, wherein transformer oil sludge or spindle oil sludge is mixed with carbon black or oil carbon before neutralization. 
     
     
       6. The varnish for a printing ink of claim 1, wherein said anionic surfactant is selected from fatty acid-type surfactants, naphthenic acid-type surfactants, sulfonic acid-type surfactants and sulfate-type surfactants. 
     
     
       7. The varnish for a printing ink of claim 1, wherein said anionic surfactant is added after washing said acid sludge with water. 
     
     
       8. The varnish for a printing ink of claim 1, wherein said polyvalent inorganic salt is a water soluble aluminum salt. 
     
     
       9. The varnish for a printing ink of claim 1, wherein said anionic surfactant is added after washing said acid sludge with water. 
     
     
       10. A method for converting acid sludge into a varnish for printing inks which comprises; mixing an anionic surfactant with the acid sludge; neutralizing the resulting mixture with an alkali metal salt; then adding a sufficient amount of a polyvalent metal salt to convert all of the alkali metal salts of the surfactant and sludge to polyvalent metal salts, recovering the product so formed and mixing it with a mineral oil. 
     
     
       11. The method of claim 10, wherein said acid sludge is selected from transformer oil sludge, spindle oil sludge, machine oil sludge and motor oil sludge. 
     
     
       12. The method of claim 10, wherein said acid sludge is selected from machine oil sludge and motor oil sludge. 
     
     
       13. The method of claim 10, wherein said acid sludge is a polymerized sludge of a pitch prepared by heating a transformer oil sludge or a spindle oil sludge. 
     
     
       14. The method of claim 10, wherein transformer oil sludge or spindle oil sludge is mixed with carbon black or oil carbon before neutralization. 
     
     
       15. The method of claim 10, wherein said anionic surfactant is selected from fatty acid-type surfactants, naphthenic acid-type surfactants, sulfonic acid-type surfactants and sulfate-type surfactants. 
     
     
       16. The method of claim 10, wherein said anionic surfactant is added after washing said acid sludge with water. 
     
     
       17. The method of claim 10, wherein said polyvalent inorganic salt is a water soluble aluminum salt.